LDP (Leak
Detection Pump):
Most auto manufacturers that had been using a Leak Detection Pump (LDP), as
an onboard leak test for the EVAP system, are in the process of completely
phasing out the LDP pressure system and replacing it with a testing procedure
that uses vacuum.However, it is still important to understand
the function of the LDP since there are many older vehicles that were using that
system.

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3

Find EVAP Leaks
in Six Easy Steps

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4

Find Vacuum Leaks
in Five Easy Steps

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5

Find Exhaust
Leaks in Four Easy Steps

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6

EGR Valve Leaks

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7

Oil Seals &
Gasket Leaks

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Vacuum Heater
Controls;To locate climate control leaks; install the The Smoke Machine™ supply nozzle into
the main vacuum line leading to the climate controls. Turn it on and watch
the flow meter indicator ball. If the ball drops to zero the system is leak free. Now with
the The Smoke Machine™ still connected, change the heater selector lever or button from heat to
defrost to vent and while doing this watch the flow meter for any indication of
flow. If the
flow meter indicates flow in any of these positions you will know what portion of the
system has a leak. Take a bright spot lamp under the dashboard and inspect the
system for exiting smoke, or use a UV light and look for the dye pinpointing the leak.

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OBDII Mass Airflow Code:Before you waste too much time
using the wrong equipment in the attempt to diagnose a leak that
could trigger a Mass Airflow code; use the smoke machine. This
TechTip will demonstrate how to quickly find leaks that could
trigger a MAF sensor code by FIRST using the smoke machine.

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Wind and Water Leaks:

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Axle Leaks:At first glance, axle leaks may seem like a simple diagnosis. However,
they are very often misdiagnosed. Click on the PDF file to show you a very
simple and surefire way to quickly and properly diagnose an axle leak using The Smoke Machine™.

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Intercooler & Turbocharger Leaks:Engine compartments with turbochargers tend to run hotter than
those without them, causing hoses and seals to dry out and leak. For turbocharged systems
to operate efficiently there can be no leaks in the intercooler, ducting, exhaust or the
turbo itself. Intercoolers and turbochargers are tested with the engine off, as with all
tests performed with the The Smoke Machine.

To test these systems for leaks, connect the smoke supply line to
the intake system and introduce smoke into the "cold" side of the turbocharger.
With the intake under smoke pressure, the intercooler, the ducting, the waste gate, and
the "cold" side of the turbo can be inspected for leaks.

To inspect the "hot" side or exhaust side of the turbo,
introduce the smoke into the exhaust pipe using the exhaust cone and inspect the exhaust,
the exhaust manifold, and the "hot" side of the turbocharger.